抄録
Varietal differences in the susceptibility to "Akagare" disease were examined by pot experiments using particular paddy soil on which disease habitually occurs. Several varieties were grown on the soil with and without potassium supply in 1954, and also with potassium, without potassium, and without potassium but supplied with starch to the soil in 1955. Lack of potassium led to the occurrence of the disease and varietal differences in the susceptibility were observed. High negative correlation was observed between the susceptibility and starch content or content of acid hydrolyzable polysaccharides+starch. Positive correlation was found with soluble-N/starch or soluble-N/(protein-N×starch), but no significant correlation with soluble-N content, soluble-N/protein-N and K2O/N. The respiratory rate of leaves showed no significant correlation to the occurrence of the disease, but respiratory rate/starch content showed high correlation. From these results the susceptibility of rice variety seems to be closely connected with the content of respiratory substrate in plant.
